In certain crystals, photorefractive two-beam coupling is predicted for orthogonally polarized
optical beams. The prediction follows from the phenomenological tensor form of the …

Two optical beams can couple in a photorefractive crystal without using the electro-optic
effect. Beam coupling is due to a spatially modulated absorption caused by the …

The influence of the piezoelectric and photoelastic effects is experimentally demonstrated in
barium titanate (BaTiO 3). Its effect on the photorefractive two-beam coupling is investigated …

Beam-coupling experiments are carried out with two BaTiO_3 crystals as a function of the
intensity and wavelength. We demonstrate in these experiments that hole–electron …

We present a theory of the influence of photoelasticity and optical activity on the two-beam
coupling in cubic photorefractive crystals rotated around the [110] axis. The two beam …

A well-defined ring of anisotropically scattered light is observed when a linearly polarized
laser beam is incident upon a birefringent photorefractive crystal such as BaTiO_3 …

It is shown experimentally that the nonsymmetric behavior of the beam-coupling gain
coefficient of BaTiO_3 crystals with respect to the sense of the c axis is caused by an …

We present a method to separate the effects of trap gratings and electro-optic gratings in
BaTiO_3 crystals, and we determine the true spatial shift between the electro-optic grating …

We show numerically that the existing photocurrent anisotropy strongly affects the form of
initially circular beam after self-focusing in photorefractive crystals. We estimate the ellipticity …

We have measured the low-frequency (" unclamped") electrooptic and piezoelectric
coefficients in undoped BaTiO 3 and Sr x Ba 1-x Nb 2 O 6 (x= 0.61) crystals using …